Assessing jugular venous compliance with optical hemodynamic imaging by modulating intrathoracic pressure.

Significance: The internal jugular veins (IJV) are critical cerebral venous drainage pathways that are affected by right heart function. Cardiovascular disease and microgravity can alter central venous pressure (CVP) and venous return, which may contribute to increased intracranial pressure and decreased cardiac output. Assessing jugular venous compliance may provide insight into cerebral drainage and right heart function, but monitoring changes in vessel volume is challenging.

Sex-dependent jugular vein optical attenuation and distension during head-down tilt and lower body negative pressure.

Non-contact coded hemodynamic imaging (CHI) is a novel wide-field near-infrared spectroscopy system which monitors blood volume by quantifying attenuation of light passing through the underlying vessels. This study tested the hypothesis that CHI-based jugular venous attenuation (JVA) would be larger in men, and change in JVA would be greater in men compared to women during two fluid shift challenges. The association of JVA with ultrasound-based cross-sectional area (CSA) was also tested.

Optical Hemodynamic Imaging of Jugular Venous Dynamics During Altered Central Venous Pressure.

Objective: An optical imaging system is proposed for quantitatively assessing jugular venous response to altered central venous pressure.

Methods: The proposed system assesses sub-surface optical absorption changes from jugular venous waveforms with a spatial calibration procedure to normalize incident tissue illumination. Widefield frames of the right lateral neck were captured and calibrated using a novel flexible surface calibration method.